/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.core.actionPage;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.model.core.Layout;
import com.blandware.atleap.service.core.LayoutManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SwitchActionPageLayoutForm;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>Returns page with a list of menu items and form for switching action page
 * layout (to simplify "testing" of changed layout -- allows to see new/changed
 * menu items). 
 * </p>
 * <p><a href="CallCreateActionPageAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Sergey Zubtsovskiy <a href="mailto:sergey.zubtsovskiy@blandware.com">&lt;sergey.zubtsovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.11 $ $Date: 2006/08/03 10:07:46 $
 * @struts.action name="switchActionPageLayoutForm"
 * path="/core/actionPage/switchLayout"
 * validate="false"
 * roles="core-actionPage-switchLayout"
 * scope="session"
 * @struts.action-forward name="listMenuItems"
 * path="/core/menuItem/list.do"
 * redirect="false"
 * @struts.action-forward name="unsatisfiable"
 * path="/core/actionPage/list.do"
 */
public final class SwitchLayoutAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		SwitchActionPageLayoutForm switchLayoutForm = (SwitchActionPageLayoutForm) form;

		Long actionPageId = null;
		if ( !GenericValidator.isBlankOrNull(switchLayoutForm.getActionPageId()) ) {
			actionPageId = Long.valueOf(switchLayoutForm.getActionPageId());
		} else {
			if ( log.isWarnEnabled() ) {
				log.warn("Missing action page ID. Returning to index...");
			}
			return mapping.findForward("admin");
		}

		String layoutDefinition = switchLayoutForm.getLayoutDefinition();
		if ( GenericValidator.isBlankOrNull(layoutDefinition) ) {
			// get first layout
			LayoutManager layoutManager = (LayoutManager) getBean(Constants.LAYOUT_MANAGER_BEAN);
			List layouts = null;
			layouts = layoutManager.listLayouts(null).asList();

			if ( layouts == null ) {
				// no layout found
				layouts = new ArrayList();
			}

			if ( !layouts.isEmpty() ) {
				Layout layout = (Layout) layouts.get(0);
				layoutDefinition = layout.getDefinition();
			}
		}

		request.getSession().setAttribute(WebappConstants.LAYOUT_DEFINITION_KEY, layoutDefinition);
		request.getSession().setAttribute(WebappConstants.OWNER_ID_KEY, actionPageId);
		return mapping.findForward("listMenuItems");
	}
}